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Pneumatic tire

Pending Publication Date: 2022-08-25
YOKOHAMA RUBBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The patent describes a special tire made for high-speed driving and wet conditions that reduces road noise. It uses a special reinforcing material made of PET fiber to improve durability.

Problems solved by technology

However, the PET fiber cord tends to generate heat more easily than the conventional nylon fiber cord, and in particular, there is a problem that the lower the tension applied to the cord, the easier it is to generate heat.

Method used

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  • Pneumatic tire

Examples

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examples

[0034]Tires of Conventional Example 1, Comparative Examples 1 to 5, and Examples 1 to 13 were manufactured in which the tires have a size of 225 / 60R18 and have the basic structure illustrated in the Drawing. The elastic modulus [cN / (tex·%)] at a load of 2.0 cN / dtex at 100° C. and the in-tire cord tension [cN / dtex] were set for the organic fiber cord (PET fiber cord) constituting the belt cover layer as shown in Tables 1 and 2, and the blending of the rubber composition constituting the coating rubber, a strength at break TB (100° C.) [MPa] at 100° C., an elongation at break EB (100° C.) [%] at 100° C., the storage modulus E1 (100° C.) [MPa] at 100° C., and the proportion of free sulfur [%] were changed for the coating rubber (belt cover coating rubber) that covers the organic fiber cord (PET fiber cord) as shown in Tables 1 and 2.

[0035]In these examples, the belt cover layer has a jointless structure in which a strip formed by bunching one organic fiber cord (PET fiber cord) and cov...

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Abstract

Provided is a pneumatic tire. A belt cover layer made of an organic fiber cord spirally wound along the tire circumferential direction is provided on the outer circumferential side of a belt layer in a tread portion, and a polyethylene terephthalate fiber cord of which the elastic modulus under a load of 2.0 cN / dtex at 100° C. is in the range of 3.5 cN / (tex·%) to 5.5 cN / (tex·%) is used as the organic fiber cord. The coating rubber covering the organic fiber cord contains one or more of natural rubber, styrene-butadiene rubber, or butadiene rubber as a rubber component. The coating rubber is formed of a rubber composition in which the content of natural rubber in the rubber component is 50 mass % or more, and 5.0 parts by mass to 9.0 parts by mass of zinc oxide is blended per 100 parts by mass of the rubber component.

Description

TECHNICAL FIELD[0001]The present technology relates to a pneumatic tire using polyethylene terephthalate (PET) fiber cords in a belt cover layer.BACKGROUND ART[0002]Pneumatic tires for a passenger vehicle or a light truck typically include a structure in which a carcass layer is mounted between a pair of bead portions, a plurality of belt layers are disposed on an outer circumferential side of the carcass layer in a tread portion, and a belt cover layer is disposed on an outer circumferential side of the belt layer, the belt cover layer including a plurality of organic fiber cords spirally wound along a tire circumferential direction. In this structure, the belt cover layer contributes to the improvement of high-speed durability and also contributes to the reduction of mid-range frequency road noise.[0003]In the related art, nylon fiber cords are mainly applied to the organic fiber cords used in the belt cover layer; however, it has been proposed to use polyethylene terephthalate fi...

Claims

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Application Information

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IPC IPC(8): B60C9/20B60C9/00D02G3/48C08L7/00
CPCB60C9/2003B60C9/0042D02G3/48C08L7/00B60C2009/2077B60C2001/0066B60C9/00B60C9/20B60C9/22D10B2331/04B60C9/2204B60C2001/0083B60C2009/2214B60C2009/0035B60C2009/2242B60C2009/2209B60C2009/2238C08L9/06C08L91/00C08L45/00C08K3/04C08K5/09C08K3/22C08K5/47C08K3/06B60C2009/2093
Inventor OZAKI, MAKOTOHARIKAE, SHINYASUGIURA, HIROKINAKAJIMA, MIYUKI
Owner YOKOHAMA RUBBER CO LTD
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